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Re: WAL

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Dextra - Gustavo Bartz Guedes <gustavo-bartz(at)dextra(dot)com(dot)br>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: WAL
Date: 2005-04-25 17:37:50
Message-ID: 200504251737.j3PHboA22494@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-admin
Dextra - Gustavo Bartz Guedes wrote:
> Greetings,
> Turning of fsync does not mean turn off WAL as well? So why does the 
> xlog files (pg_xlog) still being recycled?

No, fsync only is used for server crashes.  WAL is still used to recover
from database crashes when the operating system keeps running.  We write
to WAL on commit but not to the file system on commit, and WAL cleans
that up.

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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